Browsing Theses and Dissertations (Mechanical and Aeronautical Engineering) by Supervisor "Els, P.S. (Pieter Schalk)"
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- Browsing Theses and Dissertations (Mechanical and Aeronautical Engineering) by Supervisor
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Browsing Theses and Dissertations (Mechanical and Aeronautical Engineering) by Supervisor "Els, P.S. (Pieter Schalk)"
Now showing items 1-20 of 50
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(University of Pretoria, 2016)The interaction between tyres and terrain is one of the most studied areas in the vehicle dynamics and terramechanics research communities because it is the only region where excitation forces act on the vehicle if ...
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(University of Pretoria, 2018)Anti-lock braking systems (ABS) have revolutionised vehicle safety by providing a mechanism for braking effectively whilst maintaining stability control. ABS works very well on smooth terrains, where there are little ...
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(University of Pretoria, 2015)The safety of motor vehicles is of primary concern in the modern age as the death rate of road users are still at unacceptably high numbers and is the second largest cause for unnatural death worldwide. Consumers often ...
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(University of Pretoria, 2021)Statistics show that unstable articulated vehicles pose a serious threat to the occupants driving them as well as the occupants of the vehicles around them. An articulated vehicle typically experiences three types of ...
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(University of Pretoria, 2016)Sport utility vehicles typically feature high ground clearances that allow them to be used in off-road conditions. Their use is not limited to off-road conditions and they are often used as day-to-day family vehicles. On ...
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(University of Pretoria, 2018)The research done in this study investigates physiological responses to vertical whole-body vibration. The aim is to determine whether or not quantifiable responses can be found when evaluating changes in breathing rate, ...
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(University of Pretoria, 2013)The purpose of this study is to mitigate the compromise between ride comfort and handling of a small single seat off-road vehicle known as a Baja. This has been achieved by semi-active control of the suspension system ...
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(University of Pretoria, 2018)All forces acting on a road vehicle are either generated in the tyre-road interface or are due to aerodynamic effects, where at low speeds the latter can be ignored. The accuracy of the tyre model, describing the forces ...
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(University of Pretoria, 2017)The aim of this study is to design, implement and investigate the use of a Magneto-Rheological (MR) equipped Hydro-Pneumatic suspension system to solve the ride versus handling compromise of off-road vehicles. This suspension ...
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(University of Pretoria, 2015)Except for aerodynamics forces, all vehicle excitation forces are generated at the tyre-road interface. Considering low speed applications, such as terramechanics where the aerodynamics force are negligible, the road-tyre ...
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(University of Pretoria, 2019)Even though infants are frequent vehicle travellers, little is known about the effect of vibrations on their comfort and health. Some studies have characterised the vibrational response of infant car seats, while others ...
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(University of Pretoria, 2017)With an increasing need for accurate full vehicle models, a sensitivity analysis of the modelling of tyres depending on their age and wear was conducted. This included a sensitivity analysis into the accuracy of acquiring ...
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(University of Pretoria, 2014)Validated simulation models have become ever more important in the current technological and economic environment, where simulation is an integral part of the design process. In the field of vehicle dynamics, it is no ...
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(University of Pretoria, 2018)The tyre contact patch is important to vehicle dynamics analysis since this is where the tyre-road interaction forces originate. If the contact patch mechanism is understood in depth and can be simulated accurately, it ...
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(University of Pretoria, 2008-08-05)The efficient optimisation of vehicle suspension systems is of increasing interest for vehicle manufacturers. The main aim of this thesis is to develop a methodology for efficiently optimising an off-road vehicle’s suspension ...
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(University of Pretoria, 2022)The Bekker‐Wong soil‐wheel interaction model has been widely adopted in the terramechanics field. This model traditionally requires the soil to be characterised using a Bevameter, which entails performing in situ plate ...
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(University of Pretoria, 2014)Most tyre models developed to date require a fair amount of data before an accurate representation of the tyre can be obtained. This study entails the development of a simplified, yet accurate, non-linear Finite Element ...
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(University of Pretoria, 2016)Tyre modelling has been a focal point of vehicle dynamics modelling since the beginning of vehicle dynamics research. Many tyre models are based on single point contact models which utilize some form of the Pacejka Magic ...
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(University of Pretoria, 2011-11-21)High speed cornering of an off-road vehicle poses considerable challenges to the development of an autonomous vehicle due to the non-linear dynamics of the tyre road interface as well as those of the vehicle as a whole ...
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(University of Pretoria, 2019)A well-known challenge in vehicle dynamics is to design a vehicle that will not only keep the occupants comfortable, but will also ensure safe and stable operation during various manoeuvres over multiple driving surfaces. ...
Now showing items 1-20 of 50